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8,1 . 12 = 11 . 8 + x
97,2 = 88 + x
x = 9,2
maka untuk mendapatkan nilai rata-rata 8,1 maka nilai ulangan ke 12 harus 9,2
x = 88
8,1 = 88 + x/12
97,2 = 88 + x
97,2 - 88 = x
9,2 = x